Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/concurrentMark.hpp @ 6862:8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
Summary: Change the type of various task num fields, parameters etc to unsigned and rename them to be more consistent with the other collectors. Code changes were also reviewed by Vitaly Davidovich.
Reviewed-by: johnc
Contributed-by: Kaushik Srenevasan <kaushik@twitter.com>
| author | johnc |
|---|---|
| date | Sat, 06 Oct 2012 01:17:44 -0700 |
| parents | 988bf00cc564 |
| children | 442f942757c0 |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_HPP |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_HPP | |
| 27 | |
| 2152 | 28 #include "gc_implementation/g1/heapRegionSets.hpp" |
| 1972 | 29 #include "utilities/taskqueue.hpp" |
| 30 | |
| 342 | 31 class G1CollectedHeap; |
| 32 class CMTask; | |
| 6197 | 33 typedef GenericTaskQueue<oop, mtGC> CMTaskQueue; |
| 34 typedef GenericTaskQueueSet<CMTaskQueue, mtGC> CMTaskQueueSet; | |
| 342 | 35 |
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36 // Closure used by CM during concurrent reference discovery |
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37 // and reference processing (during remarking) to determine |
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38 // if a particular object is alive. It is primarily used |
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39 // to determine if referents of discovered reference objects |
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40 // are alive. An instance is also embedded into the |
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41 // reference processor as the _is_alive_non_header field |
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42 class G1CMIsAliveClosure: public BoolObjectClosure { |
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43 G1CollectedHeap* _g1; |
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44 public: |
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45 G1CMIsAliveClosure(G1CollectedHeap* g1) : _g1(g1) { } |
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46 |
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47 void do_object(oop obj) { |
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48 ShouldNotCallThis(); |
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49 } |
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50 bool do_object_b(oop obj); |
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51 }; |
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52 |
| 342 | 53 // A generic CM bit map. This is essentially a wrapper around the BitMap |
| 54 // class, with one bit per (1<<_shifter) HeapWords. | |
| 55 | |
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56 class CMBitMapRO VALUE_OBJ_CLASS_SPEC { |
| 342 | 57 protected: |
| 58 HeapWord* _bmStartWord; // base address of range covered by map | |
| 59 size_t _bmWordSize; // map size (in #HeapWords covered) | |
| 60 const int _shifter; // map to char or bit | |
| 61 VirtualSpace _virtual_space; // underlying the bit map | |
| 62 BitMap _bm; // the bit map itself | |
| 63 | |
| 64 public: | |
| 65 // constructor | |
| 66 CMBitMapRO(ReservedSpace rs, int shifter); | |
| 67 | |
| 68 enum { do_yield = true }; | |
| 69 | |
| 70 // inquiries | |
| 71 HeapWord* startWord() const { return _bmStartWord; } | |
| 72 size_t sizeInWords() const { return _bmWordSize; } | |
| 73 // the following is one past the last word in space | |
| 74 HeapWord* endWord() const { return _bmStartWord + _bmWordSize; } | |
| 75 | |
| 76 // read marks | |
| 77 | |
| 78 bool isMarked(HeapWord* addr) const { | |
| 79 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
| 80 "outside underlying space?"); | |
| 81 return _bm.at(heapWordToOffset(addr)); | |
| 82 } | |
| 83 | |
| 84 // iteration | |
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85 inline bool iterate(BitMapClosure* cl, MemRegion mr); |
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86 inline bool iterate(BitMapClosure* cl); |
| 342 | 87 |
| 88 // Return the address corresponding to the next marked bit at or after | |
| 89 // "addr", and before "limit", if "limit" is non-NULL. If there is no | |
| 90 // such bit, returns "limit" if that is non-NULL, or else "endWord()". | |
| 91 HeapWord* getNextMarkedWordAddress(HeapWord* addr, | |
| 92 HeapWord* limit = NULL) const; | |
| 93 // Return the address corresponding to the next unmarked bit at or after | |
| 94 // "addr", and before "limit", if "limit" is non-NULL. If there is no | |
| 95 // such bit, returns "limit" if that is non-NULL, or else "endWord()". | |
| 96 HeapWord* getNextUnmarkedWordAddress(HeapWord* addr, | |
| 97 HeapWord* limit = NULL) const; | |
| 98 | |
| 99 // conversion utilities | |
| 100 // XXX Fix these so that offsets are size_t's... | |
| 101 HeapWord* offsetToHeapWord(size_t offset) const { | |
| 102 return _bmStartWord + (offset << _shifter); | |
| 103 } | |
| 104 size_t heapWordToOffset(HeapWord* addr) const { | |
| 105 return pointer_delta(addr, _bmStartWord) >> _shifter; | |
| 106 } | |
| 107 int heapWordDiffToOffsetDiff(size_t diff) const; | |
| 108 HeapWord* nextWord(HeapWord* addr) { | |
| 109 return offsetToHeapWord(heapWordToOffset(addr) + 1); | |
| 110 } | |
| 111 | |
| 112 // debugging | |
| 113 NOT_PRODUCT(bool covers(ReservedSpace rs) const;) | |
| 114 }; | |
| 115 | |
| 116 class CMBitMap : public CMBitMapRO { | |
| 117 | |
| 118 public: | |
| 119 // constructor | |
| 120 CMBitMap(ReservedSpace rs, int shifter) : | |
| 121 CMBitMapRO(rs, shifter) {} | |
| 122 | |
| 123 // write marks | |
| 124 void mark(HeapWord* addr) { | |
| 125 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
| 126 "outside underlying space?"); | |
| 3771 | 127 _bm.set_bit(heapWordToOffset(addr)); |
| 342 | 128 } |
| 129 void clear(HeapWord* addr) { | |
| 130 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
| 131 "outside underlying space?"); | |
| 3771 | 132 _bm.clear_bit(heapWordToOffset(addr)); |
| 342 | 133 } |
| 134 bool parMark(HeapWord* addr) { | |
| 135 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
| 136 "outside underlying space?"); | |
| 3771 | 137 return _bm.par_set_bit(heapWordToOffset(addr)); |
| 342 | 138 } |
| 139 bool parClear(HeapWord* addr) { | |
| 140 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
| 141 "outside underlying space?"); | |
| 3771 | 142 return _bm.par_clear_bit(heapWordToOffset(addr)); |
| 342 | 143 } |
| 144 void markRange(MemRegion mr); | |
| 145 void clearAll(); | |
| 146 void clearRange(MemRegion mr); | |
| 147 | |
| 148 // Starting at the bit corresponding to "addr" (inclusive), find the next | |
| 149 // "1" bit, if any. This bit starts some run of consecutive "1"'s; find | |
| 150 // the end of this run (stopping at "end_addr"). Return the MemRegion | |
| 151 // covering from the start of the region corresponding to the first bit | |
| 152 // of the run to the end of the region corresponding to the last bit of | |
| 153 // the run. If there is no "1" bit at or after "addr", return an empty | |
| 154 // MemRegion. | |
| 155 MemRegion getAndClearMarkedRegion(HeapWord* addr, HeapWord* end_addr); | |
| 156 }; | |
| 157 | |
| 158 // Represents a marking stack used by the CM collector. | |
| 159 // Ideally this should be GrowableArray<> just like MSC's marking stack(s). | |
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160 class CMMarkStack VALUE_OBJ_CLASS_SPEC { |
| 342 | 161 ConcurrentMark* _cm; |
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162 oop* _base; // bottom of stack |
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163 jint _index; // one more than last occupied index |
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164 jint _capacity; // max #elements |
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165 jint _saved_index; // value of _index saved at start of GC |
| 342 | 166 NOT_PRODUCT(jint _max_depth;) // max depth plumbed during run |
| 167 | |
| 168 bool _overflow; | |
| 169 DEBUG_ONLY(bool _drain_in_progress;) | |
| 170 DEBUG_ONLY(bool _drain_in_progress_yields;) | |
| 171 | |
| 172 public: | |
| 173 CMMarkStack(ConcurrentMark* cm); | |
| 174 ~CMMarkStack(); | |
| 175 | |
| 176 void allocate(size_t size); | |
| 177 | |
| 178 oop pop() { | |
| 179 if (!isEmpty()) { | |
| 180 return _base[--_index] ; | |
| 181 } | |
| 182 return NULL; | |
| 183 } | |
| 184 | |
| 185 // If overflow happens, don't do the push, and record the overflow. | |
| 186 // *Requires* that "ptr" is already marked. | |
| 187 void push(oop ptr) { | |
| 188 if (isFull()) { | |
| 189 // Record overflow. | |
| 190 _overflow = true; | |
| 191 return; | |
| 192 } else { | |
| 193 _base[_index++] = ptr; | |
| 194 NOT_PRODUCT(_max_depth = MAX2(_max_depth, _index)); | |
| 195 } | |
| 196 } | |
| 197 // Non-block impl. Note: concurrency is allowed only with other | |
| 198 // "par_push" operations, not with "pop" or "drain". We would need | |
| 199 // parallel versions of them if such concurrency was desired. | |
| 200 void par_push(oop ptr); | |
| 201 | |
| 202 // Pushes the first "n" elements of "ptr_arr" on the stack. | |
| 203 // Non-block impl. Note: concurrency is allowed only with other | |
| 204 // "par_adjoin_arr" or "push" operations, not with "pop" or "drain". | |
| 205 void par_adjoin_arr(oop* ptr_arr, int n); | |
| 206 | |
| 207 // Pushes the first "n" elements of "ptr_arr" on the stack. | |
| 208 // Locking impl: concurrency is allowed only with | |
| 209 // "par_push_arr" and/or "par_pop_arr" operations, which use the same | |
| 210 // locking strategy. | |
| 211 void par_push_arr(oop* ptr_arr, int n); | |
| 212 | |
| 213 // If returns false, the array was empty. Otherwise, removes up to "max" | |
| 214 // elements from the stack, and transfers them to "ptr_arr" in an | |
| 215 // unspecified order. The actual number transferred is given in "n" ("n | |
| 216 // == 0" is deliberately redundant with the return value.) Locking impl: | |
| 217 // concurrency is allowed only with "par_push_arr" and/or "par_pop_arr" | |
| 218 // operations, which use the same locking strategy. | |
| 219 bool par_pop_arr(oop* ptr_arr, int max, int* n); | |
| 220 | |
| 221 // Drain the mark stack, applying the given closure to all fields of | |
| 222 // objects on the stack. (That is, continue until the stack is empty, | |
| 223 // even if closure applications add entries to the stack.) The "bm" | |
| 224 // argument, if non-null, may be used to verify that only marked objects | |
| 225 // are on the mark stack. If "yield_after" is "true", then the | |
| 226 // concurrent marker performing the drain offers to yield after | |
| 227 // processing each object. If a yield occurs, stops the drain operation | |
| 228 // and returns false. Otherwise, returns true. | |
| 229 template<class OopClosureClass> | |
| 230 bool drain(OopClosureClass* cl, CMBitMap* bm, bool yield_after = false); | |
| 231 | |
| 232 bool isEmpty() { return _index == 0; } | |
| 233 bool isFull() { return _index == _capacity; } | |
| 234 int maxElems() { return _capacity; } | |
| 235 | |
| 236 bool overflow() { return _overflow; } | |
| 237 void clear_overflow() { _overflow = false; } | |
| 238 | |
| 239 int size() { return _index; } | |
| 240 | |
| 241 void setEmpty() { _index = 0; clear_overflow(); } | |
| 242 | |
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243 // Record the current index. |
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244 void note_start_of_gc(); |
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245 |
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246 // Make sure that we have not added any entries to the stack during GC. |
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247 void note_end_of_gc(); |
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248 |
| 342 | 249 // iterate over the oops in the mark stack, up to the bound recorded via |
| 250 // the call above. | |
| 251 void oops_do(OopClosure* f); | |
| 252 }; | |
| 253 | |
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254 class ForceOverflowSettings VALUE_OBJ_CLASS_SPEC { |
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255 private: |
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256 #ifndef PRODUCT |
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257 uintx _num_remaining; |
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258 bool _force; |
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259 #endif // !defined(PRODUCT) |
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260 |
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261 public: |
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262 void init() PRODUCT_RETURN; |
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263 void update() PRODUCT_RETURN; |
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264 bool should_force() PRODUCT_RETURN_( return false; ); |
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265 }; |
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266 |
| 342 | 267 // this will enable a variety of different statistics per GC task |
| 268 #define _MARKING_STATS_ 0 | |
| 269 // this will enable the higher verbose levels | |
| 270 #define _MARKING_VERBOSE_ 0 | |
| 271 | |
| 272 #if _MARKING_STATS_ | |
| 273 #define statsOnly(statement) \ | |
| 274 do { \ | |
| 275 statement ; \ | |
| 276 } while (0) | |
| 277 #else // _MARKING_STATS_ | |
| 278 #define statsOnly(statement) \ | |
| 279 do { \ | |
| 280 } while (0) | |
| 281 #endif // _MARKING_STATS_ | |
| 282 | |
| 283 typedef enum { | |
| 284 no_verbose = 0, // verbose turned off | |
| 285 stats_verbose, // only prints stats at the end of marking | |
| 286 low_verbose, // low verbose, mostly per region and per major event | |
| 287 medium_verbose, // a bit more detailed than low | |
| 288 high_verbose // per object verbose | |
| 289 } CMVerboseLevel; | |
| 290 | |
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291 class YoungList; |
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292 |
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293 // Root Regions are regions that are not empty at the beginning of a |
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294 // marking cycle and which we might collect during an evacuation pause |
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295 // while the cycle is active. Given that, during evacuation pauses, we |
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296 // do not copy objects that are explicitly marked, what we have to do |
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297 // for the root regions is to scan them and mark all objects reachable |
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298 // from them. According to the SATB assumptions, we only need to visit |
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299 // each object once during marking. So, as long as we finish this scan |
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300 // before the next evacuation pause, we can copy the objects from the |
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301 // root regions without having to mark them or do anything else to them. |
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302 // |
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303 // Currently, we only support root region scanning once (at the start |
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304 // of the marking cycle) and the root regions are all the survivor |
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305 // regions populated during the initial-mark pause. |
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306 class CMRootRegions VALUE_OBJ_CLASS_SPEC { |
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307 private: |
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308 YoungList* _young_list; |
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309 ConcurrentMark* _cm; |
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310 |
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311 volatile bool _scan_in_progress; |
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312 volatile bool _should_abort; |
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313 HeapRegion* volatile _next_survivor; |
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314 |
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315 public: |
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316 CMRootRegions(); |
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317 // We actually do most of the initialization in this method. |
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318 void init(G1CollectedHeap* g1h, ConcurrentMark* cm); |
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319 |
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320 // Reset the claiming / scanning of the root regions. |
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321 void prepare_for_scan(); |
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322 |
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323 // Forces get_next() to return NULL so that the iteration aborts early. |
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324 void abort() { _should_abort = true; } |
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325 |
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326 // Return true if the CM thread are actively scanning root regions, |
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327 // false otherwise. |
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328 bool scan_in_progress() { return _scan_in_progress; } |
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329 |
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330 // Claim the next root region to scan atomically, or return NULL if |
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331 // all have been claimed. |
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332 HeapRegion* claim_next(); |
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333 |
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334 // Flag that we're done with root region scanning and notify anyone |
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335 // who's waiting on it. If aborted is false, assume that all regions |
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336 // have been claimed. |
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337 void scan_finished(); |
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338 |
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339 // If CM threads are still scanning root regions, wait until they |
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340 // are done. Return true if we had to wait, false otherwise. |
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341 bool wait_until_scan_finished(); |
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342 }; |
| 342 | 343 |
| 344 class ConcurrentMarkThread; | |
| 345 | |
| 6197 | 346 class ConcurrentMark: public CHeapObj<mtGC> { |
| 342 | 347 friend class ConcurrentMarkThread; |
| 348 friend class CMTask; | |
| 349 friend class CMBitMapClosure; | |
| 350 friend class CMGlobalObjectClosure; | |
| 351 friend class CMRemarkTask; | |
| 352 friend class CMConcurrentMarkingTask; | |
| 353 friend class G1ParNoteEndTask; | |
| 354 friend class CalcLiveObjectsClosure; | |
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355 friend class G1CMRefProcTaskProxy; |
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356 friend class G1CMRefProcTaskExecutor; |
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357 friend class G1CMParKeepAliveAndDrainClosure; |
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358 friend class G1CMParDrainMarkingStackClosure; |
| 342 | 359 |
| 360 protected: | |
| 361 ConcurrentMarkThread* _cmThread; // the thread doing the work | |
| 362 G1CollectedHeap* _g1h; // the heap. | |
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363 uint _parallel_marking_threads; // the number of marking |
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364 // threads we're use |
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365 uint _max_parallel_marking_threads; // max number of marking |
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366 // threads we'll ever use |
| 342 | 367 double _sleep_factor; // how much we have to sleep, with |
| 368 // respect to the work we just did, to | |
| 369 // meet the marking overhead goal | |
| 370 double _marking_task_overhead; // marking target overhead for | |
| 371 // a single task | |
| 372 | |
| 373 // same as the two above, but for the cleanup task | |
| 374 double _cleanup_sleep_factor; | |
| 375 double _cleanup_task_overhead; | |
| 376 | |
| 2152 | 377 FreeRegionList _cleanup_list; |
| 342 | 378 |
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379 // Concurrent marking support structures |
| 342 | 380 CMBitMap _markBitMap1; |
| 381 CMBitMap _markBitMap2; | |
| 382 CMBitMapRO* _prevMarkBitMap; // completed mark bitmap | |
| 383 CMBitMap* _nextMarkBitMap; // under-construction mark bitmap | |
| 384 | |
| 385 BitMap _region_bm; | |
| 386 BitMap _card_bm; | |
| 387 | |
| 388 // Heap bounds | |
| 389 HeapWord* _heap_start; | |
| 390 HeapWord* _heap_end; | |
| 391 | |
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392 // Root region tracking and claiming. |
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393 CMRootRegions _root_regions; |
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394 |
| 342 | 395 // For gray objects |
| 396 CMMarkStack _markStack; // Grey objects behind global finger. | |
| 397 HeapWord* volatile _finger; // the global finger, region aligned, | |
| 398 // always points to the end of the | |
| 399 // last claimed region | |
| 400 | |
| 401 // marking tasks | |
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402 uint _max_worker_id;// maximum worker id |
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403 uint _active_tasks; // task num currently active |
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404 CMTask** _tasks; // task queue array (max_worker_id len) |
| 342 | 405 CMTaskQueueSet* _task_queues; // task queue set |
| 406 ParallelTaskTerminator _terminator; // for termination | |
| 407 | |
| 408 // Two sync barriers that are used to synchronise tasks when an | |
| 409 // overflow occurs. The algorithm is the following. All tasks enter | |
| 410 // the first one to ensure that they have all stopped manipulating | |
| 411 // the global data structures. After they exit it, they re-initialise | |
| 412 // their data structures and task 0 re-initialises the global data | |
| 413 // structures. Then, they enter the second sync barrier. This | |
| 414 // ensure, that no task starts doing work before all data | |
| 415 // structures (local and global) have been re-initialised. When they | |
| 416 // exit it, they are free to start working again. | |
| 417 WorkGangBarrierSync _first_overflow_barrier_sync; | |
| 418 WorkGangBarrierSync _second_overflow_barrier_sync; | |
| 419 | |
| 420 // this is set by any task, when an overflow on the global data | |
| 421 // structures is detected. | |
| 422 volatile bool _has_overflown; | |
| 423 // true: marking is concurrent, false: we're in remark | |
| 424 volatile bool _concurrent; | |
| 425 // set at the end of a Full GC so that marking aborts | |
| 426 volatile bool _has_aborted; | |
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427 |
| 342 | 428 // used when remark aborts due to an overflow to indicate that |
| 429 // another concurrent marking phase should start | |
| 430 volatile bool _restart_for_overflow; | |
| 431 | |
| 432 // This is true from the very start of concurrent marking until the | |
| 433 // point when all the tasks complete their work. It is really used | |
| 434 // to determine the points between the end of concurrent marking and | |
| 435 // time of remark. | |
| 436 volatile bool _concurrent_marking_in_progress; | |
| 437 | |
| 438 // verbose level | |
| 439 CMVerboseLevel _verbose_level; | |
| 440 | |
| 441 // All of these times are in ms. | |
| 442 NumberSeq _init_times; | |
| 443 NumberSeq _remark_times; | |
| 444 NumberSeq _remark_mark_times; | |
| 445 NumberSeq _remark_weak_ref_times; | |
| 446 NumberSeq _cleanup_times; | |
| 447 double _total_counting_time; | |
| 448 double _total_rs_scrub_time; | |
| 449 | |
| 450 double* _accum_task_vtime; // accumulated task vtime | |
| 451 | |
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452 FlexibleWorkGang* _parallel_workers; |
| 342 | 453 |
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454 ForceOverflowSettings _force_overflow_conc; |
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455 ForceOverflowSettings _force_overflow_stw; |
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456 |
| 342 | 457 void weakRefsWork(bool clear_all_soft_refs); |
| 458 | |
| 459 void swapMarkBitMaps(); | |
| 460 | |
| 461 // It resets the global marking data structures, as well as the | |
| 462 // task local ones; should be called during initial mark. | |
| 463 void reset(); | |
| 464 // It resets all the marking data structures. | |
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465 void clear_marking_state(bool clear_overflow = true); |
| 342 | 466 |
| 467 // It should be called to indicate which phase we're in (concurrent | |
| 468 // mark or remark) and how many threads are currently active. | |
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469 void set_phase(uint active_tasks, bool concurrent); |
| 342 | 470 // We do this after we're done with marking so that the marking data |
| 471 // structures are initialised to a sensible and predictable state. | |
| 472 void set_non_marking_state(); | |
| 473 | |
| 474 // prints all gathered CM-related statistics | |
| 475 void print_stats(); | |
| 476 | |
| 2152 | 477 bool cleanup_list_is_empty() { |
| 478 return _cleanup_list.is_empty(); | |
| 479 } | |
| 480 | |
| 342 | 481 // accessor methods |
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482 uint parallel_marking_threads() { return _parallel_marking_threads; } |
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483 uint max_parallel_marking_threads() { return _max_parallel_marking_threads;} |
| 342 | 484 double sleep_factor() { return _sleep_factor; } |
| 485 double marking_task_overhead() { return _marking_task_overhead;} | |
| 486 double cleanup_sleep_factor() { return _cleanup_sleep_factor; } | |
| 487 double cleanup_task_overhead() { return _cleanup_task_overhead;} | |
| 488 | |
| 489 HeapWord* finger() { return _finger; } | |
| 490 bool concurrent() { return _concurrent; } | |
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491 uint active_tasks() { return _active_tasks; } |
| 342 | 492 ParallelTaskTerminator* terminator() { return &_terminator; } |
| 493 | |
| 494 // It claims the next available region to be scanned by a marking | |
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495 // task/thread. It might return NULL if the next region is empty or |
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496 // we have run out of regions. In the latter case, out_of_regions() |
| 342 | 497 // determines whether we've really run out of regions or the task |
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498 // should call claim_region() again. This might seem a bit |
| 342 | 499 // awkward. Originally, the code was written so that claim_region() |
| 500 // either successfully returned with a non-empty region or there | |
| 501 // were no more regions to be claimed. The problem with this was | |
| 502 // that, in certain circumstances, it iterated over large chunks of | |
| 503 // the heap finding only empty regions and, while it was working, it | |
| 504 // was preventing the calling task to call its regular clock | |
| 505 // method. So, this way, each task will spend very little time in | |
| 506 // claim_region() and is allowed to call the regular clock method | |
| 507 // frequently. | |
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508 HeapRegion* claim_region(uint worker_id); |
| 342 | 509 |
| 510 // It determines whether we've run out of regions to scan. | |
| 511 bool out_of_regions() { return _finger == _heap_end; } | |
| 512 | |
| 513 // Returns the task with the given id | |
| 514 CMTask* task(int id) { | |
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515 assert(0 <= id && id < (int) _active_tasks, |
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516 "task id not within active bounds"); |
| 342 | 517 return _tasks[id]; |
| 518 } | |
| 519 | |
| 520 // Returns the task queue with the given id | |
| 521 CMTaskQueue* task_queue(int id) { | |
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522 assert(0 <= id && id < (int) _active_tasks, |
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523 "task queue id not within active bounds"); |
| 342 | 524 return (CMTaskQueue*) _task_queues->queue(id); |
| 525 } | |
| 526 | |
| 527 // Returns the task queue set | |
| 528 CMTaskQueueSet* task_queues() { return _task_queues; } | |
| 529 | |
| 530 // Access / manipulation of the overflow flag which is set to | |
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531 // indicate that the global stack has overflown |
| 342 | 532 bool has_overflown() { return _has_overflown; } |
| 533 void set_has_overflown() { _has_overflown = true; } | |
| 534 void clear_has_overflown() { _has_overflown = false; } | |
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535 bool restart_for_overflow() { return _restart_for_overflow; } |
| 342 | 536 |
| 537 bool has_aborted() { return _has_aborted; } | |
| 538 | |
| 539 // Methods to enter the two overflow sync barriers | |
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540 void enter_first_sync_barrier(uint worker_id); |
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541 void enter_second_sync_barrier(uint worker_id); |
| 342 | 542 |
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543 ForceOverflowSettings* force_overflow_conc() { |
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544 return &_force_overflow_conc; |
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545 } |
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546 |
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547 ForceOverflowSettings* force_overflow_stw() { |
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548 return &_force_overflow_stw; |
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549 } |
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550 |
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551 ForceOverflowSettings* force_overflow() { |
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552 if (concurrent()) { |
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553 return force_overflow_conc(); |
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554 } else { |
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555 return force_overflow_stw(); |
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556 } |
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557 } |
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558 |
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559 // Live Data Counting data structures... |
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560 // These data structures are initialized at the start of |
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561 // marking. They are written to while marking is active. |
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562 // They are aggregated during remark; the aggregated values |
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563 // are then used to populate the _region_bm, _card_bm, and |
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564 // the total live bytes, which are then subsequently updated |
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565 // during cleanup. |
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566 |
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567 // An array of bitmaps (one bit map per task). Each bitmap |
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568 // is used to record the cards spanned by the live objects |
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569 // marked by that task/worker. |
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570 BitMap* _count_card_bitmaps; |
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571 |
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572 // Used to record the number of marked live bytes |
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573 // (for each region, by worker thread). |
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574 size_t** _count_marked_bytes; |
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575 |
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576 // Card index of the bottom of the G1 heap. Used for biasing indices into |
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577 // the card bitmaps. |
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578 intptr_t _heap_bottom_card_num; |
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579 |
| 342 | 580 public: |
| 581 // Manipulation of the global mark stack. | |
| 582 // Notice that the first mark_stack_push is CAS-based, whereas the | |
| 583 // two below are Mutex-based. This is OK since the first one is only | |
| 584 // called during evacuation pauses and doesn't compete with the | |
| 585 // other two (which are called by the marking tasks during | |
| 586 // concurrent marking or remark). | |
| 587 bool mark_stack_push(oop p) { | |
| 588 _markStack.par_push(p); | |
| 589 if (_markStack.overflow()) { | |
| 590 set_has_overflown(); | |
| 591 return false; | |
| 592 } | |
| 593 return true; | |
| 594 } | |
| 595 bool mark_stack_push(oop* arr, int n) { | |
| 596 _markStack.par_push_arr(arr, n); | |
| 597 if (_markStack.overflow()) { | |
| 598 set_has_overflown(); | |
| 599 return false; | |
| 600 } | |
| 601 return true; | |
| 602 } | |
| 603 void mark_stack_pop(oop* arr, int max, int* n) { | |
| 604 _markStack.par_pop_arr(arr, max, n); | |
| 605 } | |
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606 size_t mark_stack_size() { return _markStack.size(); } |
| 342 | 607 size_t partial_mark_stack_size_target() { return _markStack.maxElems()/3; } |
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608 bool mark_stack_overflow() { return _markStack.overflow(); } |
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609 bool mark_stack_empty() { return _markStack.isEmpty(); } |
| 342 | 610 |
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611 CMRootRegions* root_regions() { return &_root_regions; } |
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612 |
| 342 | 613 bool concurrent_marking_in_progress() { |
| 614 return _concurrent_marking_in_progress; | |
| 615 } | |
| 616 void set_concurrent_marking_in_progress() { | |
| 617 _concurrent_marking_in_progress = true; | |
| 618 } | |
| 619 void clear_concurrent_marking_in_progress() { | |
| 620 _concurrent_marking_in_progress = false; | |
| 621 } | |
| 622 | |
| 623 void update_accum_task_vtime(int i, double vtime) { | |
| 624 _accum_task_vtime[i] += vtime; | |
| 625 } | |
| 626 | |
| 627 double all_task_accum_vtime() { | |
| 628 double ret = 0.0; | |
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629 for (uint i = 0; i < _max_worker_id; ++i) |
| 342 | 630 ret += _accum_task_vtime[i]; |
| 631 return ret; | |
| 632 } | |
| 633 | |
| 634 // Attempts to steal an object from the task queues of other tasks | |
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635 bool try_stealing(uint worker_id, int* hash_seed, oop& obj) { |
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636 return _task_queues->steal(worker_id, hash_seed, obj); |
| 342 | 637 } |
| 638 | |
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639 ConcurrentMark(ReservedSpace rs, uint max_regions); |
| 342 | 640 ~ConcurrentMark(); |
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641 |
| 342 | 642 ConcurrentMarkThread* cmThread() { return _cmThread; } |
| 643 | |
| 644 CMBitMapRO* prevMarkBitMap() const { return _prevMarkBitMap; } | |
| 645 CMBitMap* nextMarkBitMap() const { return _nextMarkBitMap; } | |
| 646 | |
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647 // Returns the number of GC threads to be used in a concurrent |
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648 // phase based on the number of GC threads being used in a STW |
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649 // phase. |
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650 uint scale_parallel_threads(uint n_par_threads); |
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651 |
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652 // Calculates the number of GC threads to be used in a concurrent phase. |
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653 uint calc_parallel_marking_threads(); |
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654 |
| 342 | 655 // The following three are interaction between CM and |
| 656 // G1CollectedHeap | |
| 657 | |
| 658 // This notifies CM that a root during initial-mark needs to be | |
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659 // grayed. It is MT-safe. word_size is the size of the object in |
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660 // words. It is passed explicitly as sometimes we cannot calculate |
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661 // it from the given object because it might be in an inconsistent |
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662 // state (e.g., in to-space and being copied). So the caller is |
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663 // responsible for dealing with this issue (e.g., get the size from |
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664 // the from-space image when the to-space image might be |
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665 // inconsistent) and always passing the size. hr is the region that |
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666 // contains the object and it's passed optionally from callers who |
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667 // might already have it (no point in recalculating it). |
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668 inline void grayRoot(oop obj, size_t word_size, |
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669 uint worker_id, HeapRegion* hr = NULL); |
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670 |
| 1388 | 671 // It iterates over the heap and for each object it comes across it |
| 672 // will dump the contents of its reference fields, as well as | |
| 673 // liveness information for the object and its referents. The dump | |
| 674 // will be written to a file with the following name: | |
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675 // G1PrintReachableBaseFile + "." + str. |
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676 // vo decides whether the prev (vo == UsePrevMarking), the next |
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677 // (vo == UseNextMarking) marking information, or the mark word |
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678 // (vo == UseMarkWord) will be used to determine the liveness of |
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679 // each object / referent. |
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680 // If all is true, all objects in the heap will be dumped, otherwise |
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681 // only the live ones. In the dump the following symbols / breviations |
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682 // are used: |
| 1388 | 683 // M : an explicitly live object (its bitmap bit is set) |
| 684 // > : an implicitly live object (over tams) | |
| 685 // O : an object outside the G1 heap (typically: in the perm gen) | |
| 686 // NOT : a reference field whose referent is not live | |
| 687 // AND MARKED : indicates that an object is both explicitly and | |
| 688 // implicitly live (it should be one or the other, not both) | |
| 689 void print_reachable(const char* str, | |
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690 VerifyOption vo, bool all) PRODUCT_RETURN; |
| 342 | 691 |
| 692 // Clear the next marking bitmap (will be called concurrently). | |
| 693 void clearNextBitmap(); | |
| 694 | |
| 695 // These two do the work that needs to be done before and after the | |
| 696 // initial root checkpoint. Since this checkpoint can be done at two | |
| 697 // different points (i.e. an explicit pause or piggy-backed on a | |
| 698 // young collection), then it's nice to be able to easily share the | |
| 699 // pre/post code. It might be the case that we can put everything in | |
| 700 // the post method. TP | |
| 701 void checkpointRootsInitialPre(); | |
| 702 void checkpointRootsInitialPost(); | |
| 703 | |
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704 // Scan all the root regions and mark everything reachable from |
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705 // them. |
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706 void scanRootRegions(); |
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707 |
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708 // Scan a single root region and mark everything reachable from it. |
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709 void scanRootRegion(HeapRegion* hr, uint worker_id); |
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710 |
| 342 | 711 // Do concurrent phase of marking, to a tentative transitive closure. |
| 712 void markFromRoots(); | |
| 713 | |
| 714 void checkpointRootsFinal(bool clear_all_soft_refs); | |
| 715 void checkpointRootsFinalWork(); | |
| 716 void cleanup(); | |
| 717 void completeCleanup(); | |
| 718 | |
| 719 // Mark in the previous bitmap. NB: this is usually read-only, so use | |
| 720 // this carefully! | |
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721 inline void markPrev(oop p); |
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722 |
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723 // Clears marks for all objects in the given range, for the prev, |
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724 // next, or both bitmaps. NB: the previous bitmap is usually |
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725 // read-only, so use this carefully! |
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726 void clearRangePrevBitmap(MemRegion mr); |
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727 void clearRangeNextBitmap(MemRegion mr); |
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728 void clearRangeBothBitmaps(MemRegion mr); |
| 342 | 729 |
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730 // Notify data structures that a GC has started. |
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731 void note_start_of_gc() { |
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732 _markStack.note_start_of_gc(); |
| 342 | 733 } |
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734 |
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735 // Notify data structures that a GC is finished. |
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736 void note_end_of_gc() { |
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737 _markStack.note_end_of_gc(); |
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738 } |
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739 |
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740 // Verify that there are no CSet oops on the stacks (taskqueues / |
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741 // global mark stack), enqueued SATB buffers, per-thread SATB |
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742 // buffers, and fingers (global / per-task). The boolean parameters |
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743 // decide which of the above data structures to verify. If marking |
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744 // is not in progress, it's a no-op. |
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745 void verify_no_cset_oops(bool verify_stacks, |
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746 bool verify_enqueued_buffers, |
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747 bool verify_thread_buffers, |
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748 bool verify_fingers) PRODUCT_RETURN; |
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749 |
| 342 | 750 // It is called at the end of an evacuation pause during marking so |
| 751 // that CM is notified of where the new end of the heap is. It | |
| 752 // doesn't do anything if concurrent_marking_in_progress() is false, | |
| 753 // unless the force parameter is true. | |
| 754 void update_g1_committed(bool force = false); | |
| 755 | |
| 756 bool isMarked(oop p) const { | |
| 757 assert(p != NULL && p->is_oop(), "expected an oop"); | |
| 758 HeapWord* addr = (HeapWord*)p; | |
| 759 assert(addr >= _nextMarkBitMap->startWord() || | |
| 760 addr < _nextMarkBitMap->endWord(), "in a region"); | |
| 761 | |
| 762 return _nextMarkBitMap->isMarked(addr); | |
| 763 } | |
| 764 | |
| 765 inline bool not_yet_marked(oop p) const; | |
| 766 | |
| 767 // XXX Debug code | |
| 768 bool containing_card_is_marked(void* p); | |
| 769 bool containing_cards_are_marked(void* start, void* last); | |
| 770 | |
| 771 bool isPrevMarked(oop p) const { | |
| 772 assert(p != NULL && p->is_oop(), "expected an oop"); | |
| 773 HeapWord* addr = (HeapWord*)p; | |
| 774 assert(addr >= _prevMarkBitMap->startWord() || | |
| 775 addr < _prevMarkBitMap->endWord(), "in a region"); | |
| 776 | |
| 777 return _prevMarkBitMap->isMarked(addr); | |
| 778 } | |
| 779 | |
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780 inline bool do_yield_check(uint worker_i = 0); |
| 342 | 781 inline bool should_yield(); |
| 782 | |
| 783 // Called to abort the marking cycle after a Full GC takes palce. | |
| 784 void abort(); | |
| 785 | |
| 786 // This prints the global/local fingers. It is used for debugging. | |
| 787 NOT_PRODUCT(void print_finger();) | |
| 788 | |
| 789 void print_summary_info(); | |
| 790 | |
| 1019 | 791 void print_worker_threads_on(outputStream* st) const; |
| 792 | |
| 342 | 793 // The following indicate whether a given verbose level has been |
| 794 // set. Notice that anything above stats is conditional to | |
| 795 // _MARKING_VERBOSE_ having been set to 1 | |
|
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796 bool verbose_stats() { |
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797 return _verbose_level >= stats_verbose; |
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798 } |
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799 bool verbose_low() { |
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800 return _MARKING_VERBOSE_ && _verbose_level >= low_verbose; |
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801 } |
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802 bool verbose_medium() { |
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803 return _MARKING_VERBOSE_ && _verbose_level >= medium_verbose; |
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804 } |
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805 bool verbose_high() { |
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806 return _MARKING_VERBOSE_ && _verbose_level >= high_verbose; |
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807 } |
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808 |
|
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809 // Liveness counting |
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810 |
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811 // Utility routine to set an exclusive range of cards on the given |
|
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812 // card liveness bitmap |
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813 inline void set_card_bitmap_range(BitMap* card_bm, |
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814 BitMap::idx_t start_idx, |
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815 BitMap::idx_t end_idx, |
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816 bool is_par); |
|
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817 |
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818 // Returns the card number of the bottom of the G1 heap. |
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819 // Used in biasing indices into accounting card bitmaps. |
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820 intptr_t heap_bottom_card_num() const { |
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821 return _heap_bottom_card_num; |
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822 } |
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823 |
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824 // Returns the card bitmap for a given task or worker id. |
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825 BitMap* count_card_bitmap_for(uint worker_id) { |
|
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826 assert(0 <= worker_id && worker_id < _max_worker_id, "oob"); |
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827 assert(_count_card_bitmaps != NULL, "uninitialized"); |
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828 BitMap* task_card_bm = &_count_card_bitmaps[worker_id]; |
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829 assert(task_card_bm->size() == _card_bm.size(), "size mismatch"); |
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830 return task_card_bm; |
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831 } |
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832 |
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833 // Returns the array containing the marked bytes for each region, |
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834 // for the given worker or task id. |
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835 size_t* count_marked_bytes_array_for(uint worker_id) { |
|
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836 assert(0 <= worker_id && worker_id < _max_worker_id, "oob"); |
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837 assert(_count_marked_bytes != NULL, "uninitialized"); |
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838 size_t* marked_bytes_array = _count_marked_bytes[worker_id]; |
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839 assert(marked_bytes_array != NULL, "uninitialized"); |
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840 return marked_bytes_array; |
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841 } |
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842 |
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843 // Returns the index in the liveness accounting card table bitmap |
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844 // for the given address |
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845 inline BitMap::idx_t card_bitmap_index_for(HeapWord* addr); |
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846 |
|
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847 // Counts the size of the given memory region in the the given |
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848 // marked_bytes array slot for the given HeapRegion. |
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849 // Sets the bits in the given card bitmap that are associated with the |
|
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850 // cards that are spanned by the memory region. |
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851 inline void count_region(MemRegion mr, HeapRegion* hr, |
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852 size_t* marked_bytes_array, |
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853 BitMap* task_card_bm); |
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854 |
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855 // Counts the given memory region in the task/worker counting |
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856 // data structures for the given worker id. |
|
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857 inline void count_region(MemRegion mr, HeapRegion* hr, uint worker_id); |
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858 |
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859 // Counts the given memory region in the task/worker counting |
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860 // data structures for the given worker id. |
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861 inline void count_region(MemRegion mr, uint worker_id); |
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862 |
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863 // Counts the given object in the given task/worker counting |
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864 // data structures. |
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865 inline void count_object(oop obj, HeapRegion* hr, |
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866 size_t* marked_bytes_array, |
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867 BitMap* task_card_bm); |
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868 |
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869 // Counts the given object in the task/worker counting data |
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870 // structures for the given worker id. |
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871 inline void count_object(oop obj, HeapRegion* hr, uint worker_id); |
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872 |
|
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873 // Attempts to mark the given object and, if successful, counts |
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874 // the object in the given task/worker counting structures. |
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875 inline bool par_mark_and_count(oop obj, HeapRegion* hr, |
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876 size_t* marked_bytes_array, |
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877 BitMap* task_card_bm); |
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878 |
|
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879 // Attempts to mark the given object and, if successful, counts |
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880 // the object in the task/worker counting structures for the |
|
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881 // given worker id. |
|
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882 inline bool par_mark_and_count(oop obj, size_t word_size, |
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883 HeapRegion* hr, uint worker_id); |
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884 |
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885 // Attempts to mark the given object and, if successful, counts |
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886 // the object in the task/worker counting structures for the |
|
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887 // given worker id. |
|
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888 inline bool par_mark_and_count(oop obj, HeapRegion* hr, uint worker_id); |
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889 |
|
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890 // Similar to the above routine but we don't know the heap region that |
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891 // contains the object to be marked/counted, which this routine looks up. |
|
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892 inline bool par_mark_and_count(oop obj, uint worker_id); |
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893 |
|
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894 // Similar to the above routine but there are times when we cannot |
|
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895 // safely calculate the size of obj due to races and we, therefore, |
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896 // pass the size in as a parameter. It is the caller's reponsibility |
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897 // to ensure that the size passed in for obj is valid. |
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898 inline bool par_mark_and_count(oop obj, size_t word_size, uint worker_id); |
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899 |
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900 // Unconditionally mark the given object, and unconditinally count |
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901 // the object in the counting structures for worker id 0. |
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902 // Should *not* be called from parallel code. |
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903 inline bool mark_and_count(oop obj, HeapRegion* hr); |
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904 |
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905 // Similar to the above routine but we don't know the heap region that |
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906 // contains the object to be marked/counted, which this routine looks up. |
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907 // Should *not* be called from parallel code. |
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908 inline bool mark_and_count(oop obj); |
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909 |
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910 protected: |
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911 // Clear all the per-task bitmaps and arrays used to store the |
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912 // counting data. |
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913 void clear_all_count_data(); |
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914 |
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915 // Aggregates the counting data for each worker/task |
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916 // that was constructed while marking. Also sets |
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917 // the amount of marked bytes for each region and |
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918 // the top at concurrent mark count. |
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919 void aggregate_count_data(); |
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920 |
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921 // Verification routine |
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922 void verify_count_data(); |
| 342 | 923 }; |
| 924 | |
| 925 // A class representing a marking task. | |
| 926 class CMTask : public TerminatorTerminator { | |
| 927 private: | |
| 928 enum PrivateConstants { | |
| 929 // the regular clock call is called once the scanned words reaches | |
| 930 // this limit | |
| 931 words_scanned_period = 12*1024, | |
| 932 // the regular clock call is called once the number of visited | |
| 933 // references reaches this limit | |
| 934 refs_reached_period = 384, | |
| 935 // initial value for the hash seed, used in the work stealing code | |
| 936 init_hash_seed = 17, | |
| 937 // how many entries will be transferred between global stack and | |
| 938 // local queues | |
| 939 global_stack_transfer_size = 16 | |
| 940 }; | |
| 941 | |
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942 uint _worker_id; |
| 342 | 943 G1CollectedHeap* _g1h; |
| 944 ConcurrentMark* _cm; | |
| 945 CMBitMap* _nextMarkBitMap; | |
| 946 // the task queue of this task | |
| 947 CMTaskQueue* _task_queue; | |
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948 private: |
| 342 | 949 // the task queue set---needed for stealing |
| 950 CMTaskQueueSet* _task_queues; | |
| 951 // indicates whether the task has been claimed---this is only for | |
| 952 // debugging purposes | |
| 953 bool _claimed; | |
| 954 | |
| 955 // number of calls to this task | |
| 956 int _calls; | |
| 957 | |
| 958 // when the virtual timer reaches this time, the marking step should | |
| 959 // exit | |
| 960 double _time_target_ms; | |
| 961 // the start time of the current marking step | |
| 962 double _start_time_ms; | |
| 963 | |
| 964 // the oop closure used for iterations over oops | |
| 3771 | 965 G1CMOopClosure* _cm_oop_closure; |
| 342 | 966 |
| 967 // the region this task is scanning, NULL if we're not scanning any | |
| 968 HeapRegion* _curr_region; | |
| 969 // the local finger of this task, NULL if we're not scanning a region | |
| 970 HeapWord* _finger; | |
| 971 // limit of the region this task is scanning, NULL if we're not scanning one | |
| 972 HeapWord* _region_limit; | |
| 973 | |
| 974 // the number of words this task has scanned | |
| 975 size_t _words_scanned; | |
| 976 // When _words_scanned reaches this limit, the regular clock is | |
| 977 // called. Notice that this might be decreased under certain | |
| 978 // circumstances (i.e. when we believe that we did an expensive | |
| 979 // operation). | |
| 980 size_t _words_scanned_limit; | |
| 981 // the initial value of _words_scanned_limit (i.e. what it was | |
| 982 // before it was decreased). | |
| 983 size_t _real_words_scanned_limit; | |
| 984 | |
| 985 // the number of references this task has visited | |
| 986 size_t _refs_reached; | |
| 987 // When _refs_reached reaches this limit, the regular clock is | |
| 988 // called. Notice this this might be decreased under certain | |
| 989 // circumstances (i.e. when we believe that we did an expensive | |
| 990 // operation). | |
| 991 size_t _refs_reached_limit; | |
| 992 // the initial value of _refs_reached_limit (i.e. what it was before | |
| 993 // it was decreased). | |
| 994 size_t _real_refs_reached_limit; | |
| 995 | |
| 996 // used by the work stealing stuff | |
| 997 int _hash_seed; | |
| 998 // if this is true, then the task has aborted for some reason | |
| 999 bool _has_aborted; | |
| 1000 // set when the task aborts because it has met its time quota | |
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1001 bool _has_timed_out; |
| 342 | 1002 // true when we're draining SATB buffers; this avoids the task |
| 1003 // aborting due to SATB buffers being available (as we're already | |
| 1004 // dealing with them) | |
| 1005 bool _draining_satb_buffers; | |
| 1006 | |
| 1007 // number sequence of past step times | |
| 1008 NumberSeq _step_times_ms; | |
| 1009 // elapsed time of this task | |
| 1010 double _elapsed_time_ms; | |
| 1011 // termination time of this task | |
| 1012 double _termination_time_ms; | |
| 1013 // when this task got into the termination protocol | |
| 1014 double _termination_start_time_ms; | |
| 1015 | |
| 1016 // true when the task is during a concurrent phase, false when it is | |
| 1017 // in the remark phase (so, in the latter case, we do not have to | |
| 1018 // check all the things that we have to check during the concurrent | |
| 1019 // phase, i.e. SATB buffer availability...) | |
| 1020 bool _concurrent; | |
| 1021 | |
| 1022 TruncatedSeq _marking_step_diffs_ms; | |
| 1023 | |
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1024 // Counting data structures. Embedding the task's marked_bytes_array |
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1025 // and card bitmap into the actual task saves having to go through |
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1026 // the ConcurrentMark object. |
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1027 size_t* _marked_bytes_array; |
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1028 BitMap* _card_bm; |
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1029 |
| 342 | 1030 // LOTS of statistics related with this task |
| 1031 #if _MARKING_STATS_ | |
| 1032 NumberSeq _all_clock_intervals_ms; | |
| 1033 double _interval_start_time_ms; | |
| 1034 | |
| 1035 int _aborted; | |
| 1036 int _aborted_overflow; | |
| 1037 int _aborted_cm_aborted; | |
| 1038 int _aborted_yield; | |
| 1039 int _aborted_timed_out; | |
| 1040 int _aborted_satb; | |
| 1041 int _aborted_termination; | |
| 1042 | |
| 1043 int _steal_attempts; | |
| 1044 int _steals; | |
| 1045 | |
| 1046 int _clock_due_to_marking; | |
| 1047 int _clock_due_to_scanning; | |
| 1048 | |
| 1049 int _local_pushes; | |
| 1050 int _local_pops; | |
| 1051 int _local_max_size; | |
| 1052 int _objs_scanned; | |
| 1053 | |
| 1054 int _global_pushes; | |
| 1055 int _global_pops; | |
| 1056 int _global_max_size; | |
| 1057 | |
| 1058 int _global_transfers_to; | |
| 1059 int _global_transfers_from; | |
| 1060 | |
| 1061 int _regions_claimed; | |
| 1062 int _objs_found_on_bitmap; | |
| 1063 | |
| 1064 int _satb_buffers_processed; | |
| 1065 #endif // _MARKING_STATS_ | |
| 1066 | |
| 1067 // it updates the local fields after this task has claimed | |
| 1068 // a new region to scan | |
| 1069 void setup_for_region(HeapRegion* hr); | |
| 1070 // it brings up-to-date the limit of the region | |
| 1071 void update_region_limit(); | |
| 1072 | |
| 1073 // called when either the words scanned or the refs visited limit | |
| 1074 // has been reached | |
| 1075 void reached_limit(); | |
| 1076 // recalculates the words scanned and refs visited limits | |
| 1077 void recalculate_limits(); | |
| 1078 // decreases the words scanned and refs visited limits when we reach | |
| 1079 // an expensive operation | |
| 1080 void decrease_limits(); | |
| 1081 // it checks whether the words scanned or refs visited reached their | |
| 1082 // respective limit and calls reached_limit() if they have | |
| 1083 void check_limits() { | |
| 1084 if (_words_scanned >= _words_scanned_limit || | |
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1085 _refs_reached >= _refs_reached_limit) { |
| 342 | 1086 reached_limit(); |
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1087 } |
| 342 | 1088 } |
| 1089 // this is supposed to be called regularly during a marking step as | |
| 1090 // it checks a bunch of conditions that might cause the marking step | |
| 1091 // to abort | |
| 1092 void regular_clock_call(); | |
| 1093 bool concurrent() { return _concurrent; } | |
| 1094 | |
| 1095 public: | |
| 1096 // It resets the task; it should be called right at the beginning of | |
| 1097 // a marking phase. | |
| 1098 void reset(CMBitMap* _nextMarkBitMap); | |
| 1099 // it clears all the fields that correspond to a claimed region. | |
| 1100 void clear_region_fields(); | |
| 1101 | |
| 1102 void set_concurrent(bool concurrent) { _concurrent = concurrent; } | |
| 1103 | |
| 1104 // The main method of this class which performs a marking step | |
| 1105 // trying not to exceed the given duration. However, it might exit | |
| 1106 // prematurely, according to some conditions (i.e. SATB buffers are | |
| 1107 // available for processing). | |
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1108 void do_marking_step(double target_ms, bool do_stealing, bool do_termination); |
| 342 | 1109 |
| 1110 // These two calls start and stop the timer | |
| 1111 void record_start_time() { | |
| 1112 _elapsed_time_ms = os::elapsedTime() * 1000.0; | |
| 1113 } | |
| 1114 void record_end_time() { | |
| 1115 _elapsed_time_ms = os::elapsedTime() * 1000.0 - _elapsed_time_ms; | |
| 1116 } | |
| 1117 | |
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1118 // returns the worker ID associated with this task. |
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1119 uint worker_id() { return _worker_id; } |
| 342 | 1120 |
| 1121 // From TerminatorTerminator. It determines whether this task should | |
| 1122 // exit the termination protocol after it's entered it. | |
| 1123 virtual bool should_exit_termination(); | |
| 1124 | |
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1125 // Resets the local region fields after a task has finished scanning a |
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1126 // region; or when they have become stale as a result of the region |
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1127 // being evacuated. |
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1128 void giveup_current_region(); |
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1129 |
| 342 | 1130 HeapWord* finger() { return _finger; } |
| 1131 | |
| 1132 bool has_aborted() { return _has_aborted; } | |
| 1133 void set_has_aborted() { _has_aborted = true; } | |
| 1134 void clear_has_aborted() { _has_aborted = false; } | |
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1135 bool has_timed_out() { return _has_timed_out; } |
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1136 bool claimed() { return _claimed; } |
| 342 | 1137 |
| 3771 | 1138 void set_cm_oop_closure(G1CMOopClosure* cm_oop_closure); |
| 342 | 1139 |
| 1140 // It grays the object by marking it and, if necessary, pushing it | |
| 1141 // on the local queue | |
| 3771 | 1142 inline void deal_with_reference(oop obj); |
| 342 | 1143 |
| 1144 // It scans an object and visits its children. | |
| 3771 | 1145 void scan_object(oop obj); |
| 342 | 1146 |
| 1147 // It pushes an object on the local queue. | |
| 3771 | 1148 inline void push(oop obj); |
| 342 | 1149 |
| 1150 // These two move entries to/from the global stack. | |
| 1151 void move_entries_to_global_stack(); | |
| 1152 void get_entries_from_global_stack(); | |
| 1153 | |
| 1154 // It pops and scans objects from the local queue. If partially is | |
| 1155 // true, then it stops when the queue size is of a given limit. If | |
| 1156 // partially is false, then it stops when the queue is empty. | |
| 1157 void drain_local_queue(bool partially); | |
| 1158 // It moves entries from the global stack to the local queue and | |
| 1159 // drains the local queue. If partially is true, then it stops when | |
| 1160 // both the global stack and the local queue reach a given size. If | |
| 1161 // partially if false, it tries to empty them totally. | |
| 1162 void drain_global_stack(bool partially); | |
| 1163 // It keeps picking SATB buffers and processing them until no SATB | |
| 1164 // buffers are available. | |
| 1165 void drain_satb_buffers(); | |
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1166 |
| 342 | 1167 // moves the local finger to a new location |
| 1168 inline void move_finger_to(HeapWord* new_finger) { | |
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1169 assert(new_finger >= _finger && new_finger < _region_limit, "invariant"); |
| 342 | 1170 _finger = new_finger; |
| 1171 } | |
| 1172 | |
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1173 CMTask(uint worker_id, ConcurrentMark *cm, |
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1174 size_t* marked_bytes, BitMap* card_bm, |
| 342 | 1175 CMTaskQueue* task_queue, CMTaskQueueSet* task_queues); |
| 1176 | |
| 1177 // it prints statistics associated with this task | |
| 1178 void print_stats(); | |
| 1179 | |
| 1180 #if _MARKING_STATS_ | |
| 1181 void increase_objs_found_on_bitmap() { ++_objs_found_on_bitmap; } | |
| 1182 #endif // _MARKING_STATS_ | |
| 1183 }; | |
| 1972 | 1184 |
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1185 // Class that's used to to print out per-region liveness |
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1186 // information. It's currently used at the end of marking and also |
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1187 // after we sort the old regions at the end of the cleanup operation. |
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1188 class G1PrintRegionLivenessInfoClosure: public HeapRegionClosure { |
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1189 private: |
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1190 outputStream* _out; |
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1191 |
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1192 // Accumulators for these values. |
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1193 size_t _total_used_bytes; |
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1194 size_t _total_capacity_bytes; |
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1195 size_t _total_prev_live_bytes; |
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1196 size_t _total_next_live_bytes; |
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1197 |
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1198 // These are set up when we come across a "stars humongous" region |
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1199 // (as this is where most of this information is stored, not in the |
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1200 // subsequent "continues humongous" regions). After that, for every |
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1201 // region in a given humongous region series we deduce the right |
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1202 // values for it by simply subtracting the appropriate amount from |
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1203 // these fields. All these values should reach 0 after we've visited |
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1204 // the last region in the series. |
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1205 size_t _hum_used_bytes; |
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1206 size_t _hum_capacity_bytes; |
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1207 size_t _hum_prev_live_bytes; |
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1208 size_t _hum_next_live_bytes; |
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1209 |
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1210 static double perc(size_t val, size_t total) { |
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1211 if (total == 0) { |
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1212 return 0.0; |
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1213 } else { |
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1214 return 100.0 * ((double) val / (double) total); |
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1215 } |
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1216 } |
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1217 |
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1218 static double bytes_to_mb(size_t val) { |
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1219 return (double) val / (double) M; |
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1220 } |
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1221 |
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1222 // See the .cpp file. |
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1223 size_t get_hum_bytes(size_t* hum_bytes); |
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1224 void get_hum_bytes(size_t* used_bytes, size_t* capacity_bytes, |
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1225 size_t* prev_live_bytes, size_t* next_live_bytes); |
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1226 |
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1227 public: |
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1228 // The header and footer are printed in the constructor and |
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1229 // destructor respectively. |
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1230 G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name); |
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1231 virtual bool doHeapRegion(HeapRegion* r); |
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1232 ~G1PrintRegionLivenessInfoClosure(); |
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1233 }; |
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1234 |
| 1972 | 1235 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_HPP |